Pressure Gauges

Pressure gauges, also known as pressure indicators, are instruments used to measure and display the pressure within a fluid system. They are essential components in various applications, from industrial processes and pneumatic systems to hydraulic equipment and everyday appliances.

Pressure gauges can be analogue or digital, providing readings in various units such as PSI, bar, or kPa. In Singapore, pressure gauges are widely used in industries such as manufacturing, oil and gas, and water treatment.

Types of Pressure Gauges

Pressure gauges can be categorised based on their operating principle, display mechanism, and intended application. Understanding these different types is essential for selecting the right pressure gauge for your specific needs.

Mechanical Pressure Gauges

Mechanical pressure gauges rely on mechanical components to sense and display pressure. They are known for their simplicity, durability and cost-effectiveness.

Bourdon Tube Pressure Gauge

This is the most common type of mechanical pressure gauge. It utilises a curved tube that straightens when pressure is applied, causing a pointer to move on a calibrated dial. Bourdon tube pressure gauges are versatile and widely used in various applications.

Analogue Pressure Gauge

Analogue pressure gauges, including Bourdon tube gauges, use a needle or pointer to indicate the pressure reading on a graduated dial. They provide a visual representation of the pressure and are often preferred for their simplicity and ease of use.

Diaphragm Pressure Gauge

These gauges use a flexible diaphragm that deflects under pressure, causing a connected mechanism to move a pointer on a dial. Diaphragm pressure gauges are suitable for measuring low pressures and are often used in applications involving liquids or gases with suspended particles.

Capsule Pressure Gauge

Capsule pressure gauges are similar to diaphragm gauges but use a capsule, which is essentially two diaphragms joined together, to provide greater sensitivity for measuring low pressures.

Bellows Pressure Gauge

These gauges utilise a bellows, a corrugated metal chamber, that expands or contracts with pressure changes. Bellows pressure gauges are suitable for measuring low to medium pressures and are often used in applications requiring high accuracy.

Digital Pressure Gauges

Digital pressure gauges utilise electronic sensors and digital displays to provide accurate and easy-to-read pressure measurements.

Standard Digital Pressure Gauge

Digital pressure gauges offer higher accuracy and resolution compared to analogue gauges. They provide a clear numerical display of the pressure reading, eliminating the need for interpretation and reducing the risk of errors.

Smart Pressure Gauge

Smart pressure gauges, also known as digital pressure gauges with advanced features, incorporate additional functionalities such as data logging, wireless communication and programmable alarms. They are often used in applications requiring remote monitoring, data analysis or automated control.

Specialised Pressure Gauges

In addition to mechanical and digital gauges, there are also specialised types of pressure gauges designed for specific applications.

Pneumatic Pressure Gauge

Pneumatic pressure gauges are specifically designed for use in pneumatic systems, measuring the pressure of compressed air or other gases.

Differential Pressure Gauge

These gauges measure the difference in pressure between two points in a system. They are commonly used in applications such as filter monitoring and flow measurement.

Absolute Pressure Gauge

Absolute pressure gauges measure pressure relative to a perfect vacuum. In Singapore, they are often used in applications where atmospheric pressure variations need to be accounted for, such as altimeters in aircrafts and barometers for weather monitoring.

Manometer Pressure Gauge

Manometer pressure gauges use a liquid column to measure pressure, typically for low-pressure applications or for calibration purposes.

What Are Pressure Gauges Made From?

Pressure gauges are typically made from durable materials like stainless steel or brass, though lightweight alternatives like plastic or aluminium are also available.

Case Material

• Stainless Steel: Stainless steel is a popular choice for pressure gauge cases due to its excellent corrosion resistance, durability and ability to withstand harsh environments.
• Brass: Brass offers good corrosion resistance and a distinctive appearance, making it suitable for applications like plumbing fixtures and marine equipment.
• Aluminium: Aluminium provides a lightweight alternative for applications where weight is a concern, such as in aircraft components or handheld pressure gauges.
• Plastic: Plastic cases are lightweight options often used for low-cost or disposable pressure gauges. They are suitable for non-corrosive environments but may not withstand high pressures.

Bourdon Tube Material

• Phosphor Bronze: Phosphor bronze is a copper alloy known for its good elasticity and corrosion resistance, making it suitable for Bourdon tubes in many pressure gauges.
• Stainless Steel: Stainless steel Bourdon tubes offer high strength and excellent corrosion resistance, making them suitable for demanding applications such as chemical processing and oil and gas refineries.
• Beryllium Copper: Beryllium copper is a strong and corrosion-resistant alloy often used in high-accuracy pressure gauges.

Movement and Gear Train Material

• Stainless Steel: Stainless steel is commonly used for the movement and gear train components in pressure gauges due to its durability and resistance to wear.
• Brass: Brass is another option for movement and gear train components, offering good corrosion resistance and machinability.

Diaphragm Material

• Phosphor Bronze: Phosphor bronze is often used for diaphragms in pressure gauges due to its good elasticity and corrosion resistance.
• Stainless Steel: Stainless steel diaphragms offer high strength and excellent corrosion resistance for demanding applications.

Connection Fitting Material

• Stainless Steel: Stainless steel is commonly used for connection fittings in pressure gauges due to its strength and corrosion resistance.
• Brass: Brass fittings offer good corrosion resistance and are often used in pressure gauges for compatibility with many systems.

Other Materials

• Glass or Plastic: The lens or window of a pressure gauge is typically made of glass or plastic for visibility of the dial or display.
• Silicone or Glycerine: Some pressure gauges use silicone oil or glycerine to dampen vibrations and improve the stability of the pointer or needle.

Applications of Pressure Gauges

Pressure gauges are essential tools in various industries for monitoring and controlling pressure in a wide range of applications. They ensure safe and efficient operation of systems by providing accurate pressure readings.

Manufacturing Industry

Pressure gauges are widely used in manufacturing to monitor and control pressure in various processes and equipment, including:

• Hydraulic Systems: Hydraulic pressure gauges are used in hydraulic systems to monitor the pressure of hydraulic fluids, ensuring proper operation of machinery such as presses, lifts, and robotic arms.
• Pneumatic Systems: Pneumatic pressure gauges monitor the pressure of compressed air in pneumatic systems, ensuring efficient operation of equipment like cylinders, valves, and air tools.
• Process Systems: Pressure gauges are used in process systems to monitor and control the pressure of liquids and gases in various manufacturing processes, such as chemical production, food processing, and pharmaceuticals.
• Boiler and Steam Systems: Pressure gauges are critical for monitoring pressure in boilers and steam systems, ensuring safe operation and preventing potential hazards.

Oil and Gas Industry

Pressure gauges are vital in the oil and gas industry for monitoring pressure in various stages of exploration, production and transportation, such as:

• Pipeline Monitoring: Pressure gauges are used to monitor the pressure of oil and gas in pipelines, ensuring safe and efficient transportation.
• Wellhead Pressure Monitoring: Pressure gauges monitor pressure at wellheads, providing crucial data for optimising production and ensuring safety.
• Compressor Stations: Pressure gauges are used in compressor stations to monitor and control the pressure of natural gas during transportation and storage.

Chemical Industry

Pressure gauges are essential in the chemical industry for monitoring and controlling pressure in various processes and equipment, which include:

• Reactor Pressure Monitoring: Pressure gauges are used to monitor pressure in chemical reactors, ensuring safe and optimal reaction conditions.
• Pipeline Monitoring: Pressure gauges monitor the pressure of chemicals in pipelines, ensuring safe transportation and preventing leaks.
• Tank Pressure Monitoring: Pressure gauges are used to monitor the pressure in storage tanks containing various chemicals, ensuring safe storage and preventing overpressure conditions.

The Importance of Pressure Gauge Calibration

Pressure gauge calibration is paramount for maintaining safety and ensuring accuracy across various industries. Calibration identifies and corrects any deviations, preventing potentially hazardous situations caused by inaccurate pressure measurements.

During calibration, technicians meticulously examine factors like accuracy, comparing the gauge's reading to the standard; repeatability, assessing the consistency of readings under the same conditions; hysteresis, measuring the difference in readings when pressure is increasing versus decreasing; and linearity, evaluating the consistency of the gauge's response across its entire pressure range.

RS offers in-house calibration services to ensure the accuracy and reliability of pressure gauges and other measurement equipment.

Buy Pressure Gauges from RS Singapore

RS Singapore is a trusted supplier of high-quality pressure measurement instruments, offering a wide selection to meet your needs. We partner with leading brands like WIKA, Bourdon, and Festo to provide durable and high-performing pressure gauges — as well as related products like solenoid valves and digital flow meters — for various applications.

Explore our range online, add your desired pressure gauge to your cart and enjoy a secure and convenient checkout process. We offer multiple payment options and fast delivery across Singapore, with options to suit your timeframe and budget.

For detailed information on delivery services and costs, visit our Delivery Information page. Ensure accurate pressure monitoring with a quality pressure gauge from RS Singapore — order yours today!